Question

我正在努力使用带有一些听众的布局的RecyclerView。

代码是这个

ViewHolder

 public static class ViewHolder extends RecyclerView.ViewHolder {

    public TextView tickerSymbol;
    public TextView companyName;
    public View highlightBuy;
    public LinearLayout categoryImage;
    public LayoutParams categoryLayoutParams;
    public LinearLayout arrowImage;
    public ImageView categoryIconSeparator;
    public ImageView arrowSeparator;
    public ImageView arrowIcon;
    public RelativeLayout stockRow;
    public LinearLayout tickerInfo;
    public Boolean isCategoryOpened = false;

    public ViewHolder(View itemView) {
        super(itemView);
        this.tickerSymbol = (TextView) itemView.findViewById(R.id.ticker_symbol_textview);
        this.companyName = (TextView) itemView.findViewById(R.id.company_name_textview);
        this.highlightBuy = itemView.findViewById(R.id.highlight_buy_view);
        this.categoryImage = (LinearLayout) itemView.findViewById(R.id.category_image);
        this.categoryLayoutParams = (LayoutParams) categoryImage.getLayoutParams();
        this.arrowImage = (LinearLayout) itemView.findViewById(R.id.arrow);
        this.categoryIconSeparator = (ImageView) itemView.findViewById(R.id.category_icon_separator);
        this.arrowSeparator = (ImageView) itemView.findViewById(R.id.arrow_separator);
        this.arrowIcon = (ImageView) itemView.findViewById(R.id.arrow_icon_imageview);
        this.stockRow = (RelativeLayout) itemView.findViewById(R.id.stock_row);
        this.tickerInfo = (LinearLayout) itemView.findViewById(R.id.ticker_info);
    }
}

onCreateViewHolder

@Override
public StockListAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

  Context context = parent.getContext();
  LayoutInflater inflater = LayoutInflater.from(context);

  View stockView = inflater.inflate(R.layout.stock_list_row, parent, false);

  return new StockListAdapter.ViewHolder(stockView);
}

onBindViewHolder

@Override
public void onBindViewHolder(final StockListAdapter.ViewHolder holder, final int position) {
  final Stock stock = mStocks.get(position);
  final int collapsedCategoryWidth = (int) mContext.getResources().getDimension(R.dimen.collapsed_category_icon_width);
  final int stockRowHeight = (int) mContext.getResources().getDimension(R.dimen.stock_row_height);

  //Reset holder status
  if (holder.isCategoryOpened) {
      holder.isCategoryOpened = false;
      holder.categoryImage.getLayoutParams().width = collapsedCategoryWidth;
      holder.categoryImage.setLayoutParams(holder.categoryImage.getLayoutParams());
      holder.arrowIcon.setRotationY(0);
  }

  holder.tickerSymbol.setText(stock.ticker);

  holder.companyName.setText(stock.name);
  holder.companyName.setSelected(true);
  holder.companyName.requestFocus();

  holder.categoryImage.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        final int newWidth;
        final int startWidth;
        final int startArrowAngle;
        final int newArrowAngle;

        if (!holder.isCategoryOpened) {
            holder.isCategoryOpened = true;
            newWidth = holder.stockRow.getWidth() - holder.categoryLayoutParams.leftMargin - holder.arrowImage.getWidth() - ((LayoutParams) holder.arrowImage.getLayoutParams()).rightMargin - holder.categoryIconSeparator.getWidth();
            startWidth = collapsedCategoryWidth;
            startArrowAngle = 0;
            newArrowAngle = 180;
        } else {
            holder.isCategoryOpened = false;
            newWidth = collapsedCategoryWidth;
            startWidth = holder.categoryImage.getWidth();
            startArrowAngle = 180;
            newArrowAngle = 0;
        }

        Animation a = new Animation() {
            @Override
            protected void applyTransformation(float interpolatedTime, Transformation t) {
                holder.categoryLayoutParams.width = startWidth + (int) ((newWidth - startWidth) * interpolatedTime);
                //MAYBE PROBLEM HERE??
                holder.categoryImage.setLayoutParams(holder.categoryLayoutParams);
                holder.arrowIcon.setRotationY(startArrowAngle + (newArrowAngle - startArrowAngle) * interpolatedTime);
            }
        };
        a.setDuration(500);
        holder.categoryImage.startAnimation(a);
    }
});

我会附上我的错误样本。

当我第一次点击一个视图时，onClick工作成功，但如果我滚动然后返回到该视图，只有箭头被翻转（这意味着onClick被调用）但是LinearLayout Width不会被修改。

但现在真正奇怪的是，如果我点击之前没有点击的其他视图，或者（我猜）还没有被回收，则会发生以下情况：

所以我想，Width已设置，但未显示。

我真的不知道如何解决这个问题。

感谢帮助或其他想法！

这是我已经尝试过的：

将状态置于股票中;
将侦听器放在适配器外;
将听众置于持有人中;

Answer 1

如果您已点击该项目，则在商店类中将1个变量添加到存储值中。

像这样的ilustration，我在商店中设置变量isSelected：

 private boolean mSelected=false;

 public boolean getIsSelected(){
        return this.mSelected;
    }
    public void setIsSelected(boolean mSelected){
        this.mSelected=mSelected;
    }

然后在你的onClick方法中，只需添加stock.setIsSelected(!stock.getIsSelected()) if条件并将if条件设置为从stock.getIsSelected()读取布尔值，然后从持有者中删除变量isCategoryOpened。

public void onClick(View v) {

        final int newWidth;
        final int startWidth;
        final int startArrowAngle;
        final int newArrowAngle;

        if (stock.getIsSelected()) {
            newWidth = holder.stockRow.getWidth() - holder.categoryLayoutParams.leftMargin - holder.arrowImage.getWidth() - ((LayoutParams) holder.arrowImage.getLayoutParams()).rightMargin - holder.categoryIconSeparator.getWidth();
            startWidth = collapsedCategoryWidth;
            startArrowAngle = 0;
            newArrowAngle = 180;
        } else {
            newWidth = collapsedCategoryWidth;
            startWidth = holder.categoryImage.getWidth();
            startArrowAngle = 180;
            newArrowAngle = 0;
        }
       stock.setIsSelected(!stock.getIsSelected())
        Animation a = new Animation() {
            @Override
            protected void applyTransformation(float interpolatedTime, Transformation t) {
                holder.categoryLayoutParams.width = startWidth + (int) ((newWidth - startWidth) * interpolatedTime);
                //MAYBE PROBLEM HERE??
                holder.categoryImage.setLayoutParams(holder.categoryLayoutParams);
                holder.arrowIcon.setRotationY(startArrowAngle + (newArrowAngle - startArrowAngle) * interpolatedTime);
            }
        };
        a.setDuration(500);
        holder.categoryImage.startAnimation(a);
    }

如果我错了，请纠正我：）

Answer 2

问题解决了，造成所有这些错误的原因是holder.companyName.requestFocus()我正在调用以在TextView中使用选框。

它出来我不需要requestFocus()才能让它正常工作，而且这是导致问题的原因。

如何在RecyclerView中修改布局宽度

2 个答案: